Decision Directed Autocorrelation Receivers for Multiantenna UWB Systems

Ultra wideband (UWB) transmissions use low transmit power and have rich multipath diversity. But UWB is also equally stringent in the timing requirements when conventional RAKE receivers are employed. Decision Directed Autocorrelation (DDA) receiver is suggested in the open literature as a low complexity alternative for the Rake receivers where, the present channel is estimated for correlation based on previous decisions and received waveforms. DDA are asymptotically optimal when compared to a Rake receiver and simple to implement. However due to the low transmit power of UWB, diversity schemes should be used to improve the performance of DDAs. In this paper we develop a DDA receiver scheme for Multiantenna UWB system employing Analog Space Time Coding. Simulations show that the Multiantenna DDA receiver schemes are also asymptotically optimal.